Back reaction of clocks and limitations on observability in closed systems

@article{Casher2000BackRO,
  title={Back reaction of clocks and limitations on observability in closed systems},
  author={Aharon Casher and Benni Reznik},
  journal={Physical Review A},
  year={2000},
  volume={62},
  pages={042104}
}
Measurements are ordinarily described with respect to absolute ``Newtonian'' time. In reality, however, the switching-on of the measuring device at the instance of the measurement requires a timing device. Hence the classical time t must be replaced by a suitable quantum time variable \ensuremath{\tau} of a physical clock. The main issue raised in this paper is that while doing so, we can no longer neglect the back reaction due to the measurement on the clock. For a von Neumann measurement… Expand

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